using System;

using System.Drawing;

using System.Linq;

using System.Reflection;

​

​

public class Program

{

    public static void Main()

    {

        var colors = typeof(Color)

            .GetProperties(BindingFlags.Public | BindingFlags.Static)

            .Select(x => (Color)x.GetValue(null))

            .Where(x => x.A != 0)

            .Select(x => $"{x.Name}  =>  #{x.R:X2}{x.G:X2}{x.B:X2}")

            .ToList();

        string.Join("\n", colors).Dump();

    }

}